PHP Error : Fatal error: Constant expression contains invalid operations
php
Solution
From the official Php documentation :
Like any other PHP static variable, static properties may only be initialized using a literal or constant before PHP 5.6; expressions are not allowed. In PHP 5.6 and later, the same rules apply as const expressions: some limited expressions are possible, provided they can be evaluated at compile time.
So you cannot initialize a static variable with another variable. Replace `$appdata['id']` with a constant string or remove the `static` attribute.
This is because all static declarations are resolved in compile-time, when the content of other variables is not known (see this other page of official doc).
Problem
I am getting an error: Fatal error: Constant expression contains invalid operations in config.php on line 214 That line was: ``` protected static $dbname = 'mydb_'.$appdata['id']; ``` Whether I did any mistakes in quotes? Or somewhere else? My search for the error message only showed a different source cause (a dynamic default value in a function definition).